Communication and repeat back system



Oct. 7, 1947. c. J. RASMUSSEN 8 COMMUNICATION AND REPEAT BACK SYSTEM Filed Nov. l0, 1944 2 Sheets-Sheet l I N VEN TOR.

Oct. 7, 1947. c. J. RASMUSSEN COMMUNICATION AND REPEAT BACK SYSTEM Filed Nov. 10, 1944 2 Sheets-Sheet 2 Fig.5

INVENTOR. @41 2, y

Patented Oct. 7, 1947 UNITED STATES PATENT OFFICE Carl J. Rasmussen, Berkeley, Calif. Application November 10, 1944, Serial No. 562,750

2 Claims.

This invention relates to an electrical recording machine, more particularly to a recording machine for an electrical engine order telegraph system for signalling from a selected point such as the pilot house of a ship to the engine room of that ship and for other similar purposes.

The principal object of the invention is to provide a recording machine for giving reliable, accurate and definite record of instructions to an engineer or operator in a ships engine room or the like from a position some distance therefrom, with provision for the engineer or operator to make a record of repeat back signals.

Other and further objects of the invention will appear more fully in the specification hereinafter following by reference to the accompanying drawing in which:

Figure 1 is an end elevation view of the recorder with the end wall and part of one gear removed showing cylinders holding recording paper, gears, motor with pinion for driving gears and solenoids with armature pins for punching paper and die for cutting paper where punched.

Figure 2 is a front view of the recorder showing most of the front wall removed and also part of one cylinder together with part of the supporting plate for the solenoids removed. The cylinder on the other side of the solenoids is not shown in or der to make the drawing more clearly understood.

Figure 3 is a plan view of a part of the recording paper on which there are typical markings of stations as required by an engine order telegraph system. The number of markings of stations on the recording paper may be more or less depending on the specific requirements.

Figure 4 is plan view of the die showing holes for receiving the armature pins which are used in cutting holes in the recording paper.

Figure 5 is an electrical wiring diagram embodying the preferred principles of my invention.

Referring to the drawings the numerals I and 2 indicate sets of solenoids having armature cores 5 and 6, respectively. Forming a part of the armature cores 5 and 6, respectively, are pins 3 and 4 which are adapted to be projected upwardly with the armature cores when the solenoids are energized. A die 9 having holes I and II is arranged above the solenoids I and 2 in a position in which the pins 3 and 4 may be projected into the said holes when the armature cores are drawn into the solenoids upon the latter becoming energized. Springs 1 and 8 or their like, are pressed tightly on the lower ends of armature cores and 6 to give shock absorbing eifect when armature cores ,5 and 6 drop by gravity toward a supporting plate I8 after electrical switches 54 and 55 connected in the circuits leading respectively to the solenoids l and 2 are opened. Switches 54 and 55, respectively are momentary contact switches which are located in the transmitter and receiver respectively of an electrical engine order telegraph system in such numbers as are necessary. In Figs. 1 and 3 are shown a recording chart 23. In the particular example shown herein nine sets of solenoids I and 2, nine operating switches 54, and nine operating switches 55 are located in the transmitter and receiver circuits respectively. When a momentary contact is made with operating switch 54 the circuit to solenoid l is closed thereby drawing armature core 5 up into the solenoid forcing pin.3 through recording paper 23 and into a hole ill of the die 9. Similarly when a momentary contact is made with operating switch 55 the circuit to solenoid 2 is closed thereby drawing armature core 6 up into the solenoid 2, thereby forcing pin 4 through the recording paper 23 and into a hole H in die 9. Pin 4 is not shown in Figure 1, but it is similar to pin 3 and directly back of it. Also when switch 54 closes the circuit to solenoid I it also closes the circuit to solenoid 48, pulling the notched end of pin 41 past pin 45 and thereby connecting contact points 49 by carrying a contact bar 56 upwardly into engagement with the said contact points, and thus closing the circuit to motor 38. Spring 45 forces pin 48 into engagement with the notch of pin 41 thereby releasably holding the same against a return to its original position. Motor 38 continues to run until a hand piece 44 is pulled out thereby releasing pin 41 which is pulled down by a spring 50 which is fastened to a pin 5| and the contact bar 56 thereby breaking the circuit to the motor. While motor 38 is running an indicating light 43 is lit giving visual indication that the motor 38 is energized.

In Figure 1 recording paper 23 is shown as being wound on cylinder 20. An end of the recording paper is held in place in a slot 24 by folding it under a wire 25 which is as long as the entire length of cylinder 20 and is held in place by springs 21 which are mounted at each end of cylinder and hooked onto each projecting end 26 of wire 25, the said springs being anchored by pins 28 which are fastened to the cylinder. Recording paper 23 is drawn through the space between the upper part of the solenoids and die 9 onto cylinder 29 where the paper is fastened in a manner similar to that shown. on cylinder 20. Cylinder 29 is fastened to gear 30 which has shaft 3| supported in bearing 32. Gear 30 is driven by gear 34 which in turn is fastened to gear 33 which has shaft 35 supported in bearing 36. Gear 33 is driven by gear 37 which is mounted on the shaft of motor 38.

The speed of the recording paper 23 being wound on cylinder 29 is such that each of the parallel lines shown on the recording paper 23 below the station heading, which may be inch apart, should require approximately fifteen seconds to pass a given point. On the recording paper 23, Figure 3, column l3 or its like is spaced for punchings from pin 4 or its like through the paper and into hole H or its like giving record of the order given to the engine room by the operator at the transmitter. Column I2 or its like is spaced for punchings from pin 3 or its like through the paper into hole In or its like giving record of repeat back signal from the engine room instrument.

The normal position of 5 or its like Figure 1 is in the lower position which allows spring I or its like to rest on plate 18. The position of 5 in Figure 1 is in a projected position showing pin 3 of armature 5 protruding into hole ll] of die 9. Bearing 22 supporting shaft 2| of cylinder 20 will have a snug fit so that a slight friction occurs making the turning of the cylinder partially restricted in order to keep recording paper 23 taut.

Provision is also made in top of cover of case 39, Figure 1 for viewing recording paper through window 49 which is supported in cover by pieces 4| which are suitably secured to the said cover. A source of power such as a battery is indicated at 52 and a master control switch at 53. The cover of the case 39 is hinged, as at 42, to a side thereof.

While I have described my invention in certain preferred embodiments, I desire that it be understood that modifications may be made and that no limitations upon my invention are intended other than are imposed by the scope of the appended claims.

I claim:

1. A communication and repeat back system comprising a rotatably mounted chart supply cylinder; an electrical motor-driven rotatably mounted chart receiving cylinder disposed in spaced relation to the chart supply cylinder and adapted to have wound thereon, chart being unwound from the chart supply cylinder; an electric motor for driving the chart receiving cylinder; first solenoid operated, chart punching means disposed in operative position to the chart between the chart supply and chart receiving cylinders; second solenoid operated, chart punching means disposed in operative position to the chart between the chart supply and chart receiving cylinders; a first electrical switch means for sending a signal; an electrical circuit means for said first solenoid operated, chart punching means including therein said first electrical switch means, a second electrical switch means for repeating a signal; an electrical circuit means for said second solenoid operated, chart punching means including therein said second electrical switch means; and an electrical circuit means for said electric motor driving the chart cylinder, including therein said first switch means.

2. A communication and repeat back system comprising a rotatably mounted chart supply cylinder; an electrical motor-driven rotatably mounted chart receiving cylinder disposed in spaced relation to the chart supply cylinder and adapted to have wound thereon the chart supplied from the chart supply cylinder; an electric motor for rotating the receiving cylinder; first solenoid operated, chart punching means disposed in operative position to the chart between the chart supply and chart receiving cylinders; second solenoid operated, chart punching means disposed in operative position to the chart between the chart supply and chart receiving cylinders; a first electrical switch means for sending a signal; an electrical circuit means for said first solenoid operated chart punching means including therein said first electrical switch means; a second electrical switch means for repeating a signal; an electrical circuit means for said second solenoid operated, chart punching means including therein said second electrical switch means; an electrical circuit means for said electric m0- tor driving the chart receiving cylinder, including therein said first switch means; and a releasable circuit completing means connected with said last mentioned circuit and arranged to be energized when said first electrical switch means is closed for selectively maintaining electrical energy to said motor after being once established.

CARL J. RASMUSSEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 509,171 Kirnan Nov, 21, 1893 1,345,626 ONeil July 6, 1920 1,400,270 Dean Dec. 13, 1921 1,456,148 Renshaw May 22, 1923 1,519,633 Schirmer Dec, 16, 1924 1,791,761 Larrabee Feb. 10, 1931 2,085,093 Gauthier June 29, 1937 2,348,158 Sprecker May 2, 1944 

